Hi,
While working on FELIX-1841, Pierre de Rop and I came across a missing
feature in the Declarative Services Specification 1.1: Functionality to
propagate service property updates for a bound service.
In the current SCR trunk we implemented a workaround, which just calls
the bind method in case of such updates (guarded by a configuration
property due to non-compliant behaviour). This workaround may work or
not, but it is probably better to come up with a real solution.
Therefore I propse the extension of Declarative Services 1.1 by adding
an "updated" method declaration in the service reference element. The
full proposal is written in FELIX-1893 [1] to which I also attached a
patched implementing this proposal.
In short:
* Extend the <reference> with an updated element naming a method
which is called when service registration properties of a bound
service are updated
* Define new namespace supporting this attribute. Only components
using this namespace (or a future newer one) will have support
for the updated attribute. Otherwise the attribute is ignored.
* The updated method has the same signature prototype specification
and lookup algorithm as the bind and unbind methods.
* Backwards compatibility is guaranteed by requiring a new namespace
for components using the updated method and by defaulting to
no propagation of updated service registration properties.
If we agree on this proposal, I would like to bring it to the OSGi Dev
List (and file an enahcement bug with OSGi).
WDYT ?
Regards
Felix
[1] https://issues.apache.org/jira/browse/FELIX-1893
